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-rw-r--r--arch/arm/vfp/vfpmodule.c55
1 files changed, 36 insertions, 19 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index a63c4be99b3..7f3f59fcaa2 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -433,7 +433,11 @@ static inline void vfp_pm_init(void) { }
* saved one. This function is used by the ptrace mechanism.
*/
#ifdef CONFIG_SMP
-void vfp_sync_state(struct thread_info *thread)
+void vfp_sync_hwstate(struct thread_info *thread)
+{
+}
+
+void vfp_flush_hwstate(struct thread_info *thread)
{
/*
* On SMP systems, the VFP state is automatically saved at every
@@ -444,35 +448,48 @@ void vfp_sync_state(struct thread_info *thread)
thread->vfpstate.hard.cpu = NR_CPUS;
}
#else
-void vfp_sync_state(struct thread_info *thread)
+void vfp_sync_hwstate(struct thread_info *thread)
{
unsigned int cpu = get_cpu();
- u32 fpexc = fmrx(FPEXC);
/*
- * If VFP is enabled, the previous state was already saved and
- * last_VFP_context updated.
+ * If the thread we're interested in is the current owner of the
+ * hardware VFP state, then we need to save its state.
*/
- if (fpexc & FPEXC_EN)
- goto out;
+ if (last_VFP_context[cpu] == &thread->vfpstate) {
+ u32 fpexc = fmrx(FPEXC);
- if (!last_VFP_context[cpu])
- goto out;
+ /*
+ * Save the last VFP state on this CPU.
+ */
+ fmxr(FPEXC, fpexc | FPEXC_EN);
+ vfp_save_state(&thread->vfpstate, fpexc | FPEXC_EN);
+ fmxr(FPEXC, fpexc);
+ }
- /*
- * Save the last VFP state on this CPU.
- */
- fmxr(FPEXC, fpexc | FPEXC_EN);
- vfp_save_state(last_VFP_context[cpu], fpexc);
- fmxr(FPEXC, fpexc);
+ put_cpu();
+}
+
+void vfp_flush_hwstate(struct thread_info *thread)
+{
+ unsigned int cpu = get_cpu();
/*
- * Set the context to NULL to force a reload the next time the thread
- * uses the VFP.
+ * If the thread we're interested in is the current owner of the
+ * hardware VFP state, then we need to save its state.
*/
- last_VFP_context[cpu] = NULL;
+ if (last_VFP_context[cpu] == &thread->vfpstate) {
+ u32 fpexc = fmrx(FPEXC);
+
+ fmxr(FPEXC, fpexc & ~FPEXC_EN);
+
+ /*
+ * Set the context to NULL to force a reload the next time
+ * the thread uses the VFP.
+ */
+ last_VFP_context[cpu] = NULL;
+ }
-out:
put_cpu();
}
#endif